Plastic boards are usually called PE (polyethylene) cutting boards, or HDPE (high-density polyethylene plastic), the material of which these boards are made. There are basically two types of HDPE boards being made. One version is made from injection-molded plastic, while the other is HDPE from an extrusion line.

Based on this passage, what type of plastic are cutting boards made from? Let's give stream of consciousness first:
The relevant sentence in the passage is: Plastic boards are usually called PE (polyethylene) cutting boards, or HDPE (high-density polyethylene plastic), the material of which these boards are made.
So, the final answer is HDPE ( high - density polyethylene plastic ).